CODEWITHSUNDEEP
phpstring
Kumar Kush
Kumar Kush

Reputation: 2594

Having issue with substr function in PHP

I have a string like this:

$geometry = "POINT (1.5041909054501184 0.39827301781943014)"

I have to split the two decimal values 1.5041909054501184 and 0.39827301781943014 based on space, into an array. For that, as expected, I have to chop-off 'POINT (' and ')' from the $geometry.

I tried the following lines:

$temp = substr($geometry , strpos($geometry, "(")+1, strlen($geometry)-2);

and

$temp = substr($geometry , strpos($geometry, "(")+1, strpos($geometry, ")")-1);

Echoing $temp in both the cases displays string as:

"1.5041909054501184 0.39827301781943014)"

How can I remove the ')' from the string $geometry?

UPDATE

How can I generalize it to strings like these?

$geometry = "POINT (1.5041909054501184 0.39827301781943014)";

and

$geometry = "POLYGON ((1.5049088554391572 0.39805485932781448, 1.5049135685638309 0.39805660717232405, 1.5049147247575003 0.39805462248168044, 1.5049101547531727 0.39805287533491257, 1.5049088554391572 0.39805485932781448))";

Upvotes: 0

Views: 138

Answers (6)

Madara's Ghost
Madara's Ghost

Reputation: 175098

Well, why not just remove them?

$geometry = "POINT (1.5041909054501184 0.39827301781943014)";
$temp1 = str_replace("POINT (", "", $geometry);
$temp = str_replace(")", "", $temp1);

Assuming your geometry syntax is always the same, this will do just fine.

Also, since you're starting 7 characters in advance, and you want to chop the last one, give the $length argument a value of length-8:

$temp = substr($geometry , strpos($geometry, "(")+1, strlen($geometry)-8);

Both of these echo correctly.

Edit!

Based on the comments:

Try this one:

$temp = preg_replace("|.+\((.+)\)|", "$1", $geometry);

Upvotes: 1

DaveRandom
DaveRandom

Reputation: 88697

Try this:

$str = 'POINT (1.5041909054501184 0.39827301781943014)';
// Remove any character that is not digit, dot or space, then trim whitespace
$stripped = trim(preg_replace('/[^0-9 \.]/', '', $str));
// Split by the space in the middle
$exploded = explode(' ', $stripped);

print_r($exploded);
/*
  Array
  (
      [0] => 1.5041909054501184
      [1] => 0.39827301781943014
  )
*/

Upvotes: 1

Ben Lee
Ben Lee

Reputation: 53349

I would just use a regular expression:

$geometry = "POINT (1.5041909054501184 0.39827301781943014)";
preg_match_all('/POINT \((\d\.\d+) (\d\.\d+)/ ', $geometry, $matches);

$matches[1][0]; // => "1.1.5041909054501184"
$matches[2][0]; // => "0.39827301781943014"

Note that these results are strings, you'll have to cast them to floats to use them as floats.

Upvotes: 2

Narek
Narek

Reputation: 3823

Maybe better with preg_replace ?

$geometry = "POINT (1.5041909054501184 0.39827301781943014)";

echo preg_replace('/POINT \((.*?)\)/uis','$1',$geometry);

Upvotes: 1

Michael Clerx
Michael Clerx

Reputation: 3056

The 3d parameter should be the length of the substring, not the position in the original string

Upvotes: 0

Howard
Howard

Reputation: 3895

The third argument to substr is not "end point" but "substring length".

So you need to say:

$start_pos = strpos($geometry, "(")+1;
$temp = substr($geometry , $start_pos , strlen($geometry)-$start_pos);

Then you can use explode to get the two decimals;

list($x, $y) = explode(' ', $temp);

or

$coordArray = explode(' ', $temp);

Upvotes: 0

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